package Example15;
class Animal{
    public void shout(){
        System.out.println("喵喵喵...");
    }
}
class Dog extends Animal{
    public void shout(){
        System.out.println("汪汪汪...");
    }
    public void eat(){
        System.out.println("吃骨头..");
    }
}
public class Example15 {
    public static void main(String[] args) {
        Dog dog=new Dog();
        Animal a1=dog;
        a1.shout();
 //       a1.eat();Animal没有eat方法 所以eat无法使用
    }
}